[nspcc-dev/neofs-node#166] *: Add project files

Create Makefile, go.mod, .golangci.yml.
Add coverage and IDE entries to .gitignore

Signed-off-by: Angira Kekteeva <kira@nspcc.ru>

.gitignore

@@ -13,3 +13,11 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+# IDE
+.idea
+.vscode
+
+# coverage
+coverage.txt
+coverage.html

.golangci.yml

@@ -0,0 +1,59 @@
+# This file contains all available configuration options
+# with their default values.
+
+# options for analysis running
+run:
+  # timeout for analysis, e.g. 30s, 5m, default is 1m
+  timeout: 5m
+
+  # include test files or not, default is true
+  tests: true
+
+# output configuration options
+output:
+  # colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
+  format: tab
+
+# all available settings of specific linters
+linters-settings:
+  exhaustive:
+    # indicates that switch statements are to be considered exhaustive if a
+    # 'default' case is present, even if all enum members aren't listed in the
+    # switch
+    default-signifies-exhaustive: true
+  govet:
+    # report about shadowed variables
+    check-shadowing: false
+
+linters:
+  enable:
+    # mandatory linters
+    - govet
+    - golint
+
+    # some default golangci-lint linters
+    - deadcode
+    - errcheck
+    - gosimple
+    - ineffassign
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+
+    # extra linters
+    - exhaustive
+    - godot
+    - gofmt
+    - whitespace
+    - goimports
+  disable-all: true
+  fast: false
+
+issues:
+  include:
+    - EXC0002 # should have a comment
+    - EXC0003 # test/Test ... consider calling this
+    - EXC0004 # govet
+    - EXC0005 # C-style breaks

Makefile

@@ -0,0 +1,40 @@
+#!/usr/bin/make -f
+
+# Run tests
+test:
+	@go test ./... -cover
+
+# Pull go dependencies
+dep:
+	@printf "⇒ Download requirements: "
+	@CGO_ENABLED=0 \
+	go mod download && echo OK
+	@printf "⇒ Tidy requirements: "
+	@CGO_ENABLED=0 \
+	go mod tidy -v && echo OK
+
+# Run linters
+lint:
+	@golangci-lint --timeout=5m run
+
+# Run tests with race detection and produce coverage output
+cover:
+	@go test -v -race ./... -coverprofile=coverage.txt -covermode=atomic
+	@go tool cover -html=coverage.txt -o coverage.html
+
+# Reformat code
+format:
+	@echo "⇒ Processing gofmt check"
+	@gofmt -s -w ./
+	@echo "⇒ Processing goimports check"
+	@goimports -w ./
+
+# Show this help prompt
+help:
+	@echo '  Usage:'
+	@echo ''
+	@echo '    make <target>'
+	@echo ''
+	@echo '  Targets:'
+	@echo ''
+	@awk '/^#/{ comment = substr($$0,3) } comment && /^[a-zA-Z][a-zA-Z0-9_-]+ ?:/{ print "   ", $$1, comment }' $(MAKEFILE_LIST) | column -t -s ':' | grep -v 'IGNORE' | sort -u

go.mod

@@ -0,0 +1,9 @@
+module github.com/nspcc-dev/neofs-sdk-go
+
+go 1.16
+
+require (
+	github.com/alecthomas/participle v0.7.1
+	github.com/nspcc-dev/neofs-api-go v1.26.1
+	github.com/stretchr/testify v1.6.1
+)